Hop drying kiln spreader - with pantograph linkage and tension spring for rollers on revolving spider

摘要

The parent patent described a hop drying kiln spreading attachment consists of a motor driven spider with radial carrier arms for raking blades and hinged links with rollers. Springs urge the rollers against a track on the inside kiln walls. In this addn. a pantograph linkage is fitted between the spider and the hinged carrier arm. A tension spring between two linkage hinges urges the roller against its track. This overcomes the difficulty to achieve an adequate contact force between roller and inside kiln wall in large hop drying kilns.